MELT BUTTER WITH OLIVE OIL IN LARGE HEAVY SKILLET OVER MEDIUM HEAT.,ADD GARLIC AND SAUTE ABOUT 1 MIN.,QUICKLY BLEND IN FLOUR WITH WIRE WHISK.,______,COOK OVER MEDIUM LOW HEAT, STIRRING CONSTANTLY UNTIL SAUCE IS SLIGHTLY THICKENED.,PLACE COOKED PASTA IN INDIVIDUAL SERVING DISHES.,SPOON CLAM SAUCE OVER PASTA.,SERVE.,PASS GRATED PARMESAN CHEESE.